info on adamo family

My great grandfother is Guiseppe Adamo.He is buried in Marion, Illinios. He might even be be my great great grand father. I am not sure Ijust started my research.What I do know is that the family name got changed to Adams.My grandfother's name was Ray Adams he had two brothers Charles and Joseph.I have been told that my family came from Sicily.If anyone has any info, please let me know. Thankyou